Wrench



pearance of the wrench as heretofore made. moved segments 18jand 19 toabut.

my invention whichis illustrated in the 16 axially towardthe piece17".;Owing',*how-' i 20 asjIm'ay adopt variationsof the preferred theteeth'of' the "rack, rather-than against,

A Referring to saiddrawingsz The wrench to which the invention in itsare provided with the necessary clearance,

' 40 fl t f th worm h b n mad in rack, and a pair of rotatable worms insaid Patented Oct. 25, 1927. I v V- it I oHaUNcnY E; TURNER,OFISEATTLE,jVASHINGTOI i." Q i war-inert.

Application filed June'15, 1925'. seria 'no'..37,063.v

My invention relates to an improvement The pieces are arranged tobe'held against iniwrenches'liaving relatively movable jaws. relativerotative "movement but are per -An object of the invention is toovercome mit'ted' relative axial displacement toward the; back-lashtorloose movement usually and fromeach other. Ashere' showncom i tprevalent? in the action of this type of necti'onbetween the piecest'oprovide. the wrench. 1 Y V foregoing relation, is effected by removingAnother object of theinvention isto ae- 'complementary]segmentsfromfadjacent'por complish theforegoing' practically jwi'thout tionsof'the'pieces and alloijviiigthe' longithe addition of' parts oraltering the aptudinal-ly out faces-.16 and 17 of theiunr i [Theinvention possesses other objects and Elioircling the shaftI12 andterposedbe features of advantage, some of which, with tween'the piece 16and the sideQI'of the thefor'egoing, will be set forth in-the fol-'stock opening22'in which the worm-isioesea 4 lowing description of thepreferred form ofv ly fitted, is'a spring- 23 which urges'th'epieiz'e 7drawings accompanyingfa'nd forming part ever, to the fact that thelatter is; permitted I of the specification. Itis tobe'understoodaxialfdisplacement from tlie'i'formerlwhile that' I' do not"limitmyselfto the showing both are engaged 'with therack', pressure of i madeby' thesaid drawings and description, thesp'ring will force the piece1'6against- 7 a o form-within the scope-of-my invention asset the-piece17 -and the la r w l re ei th forth in the-claims. forceofthespringonlythrough tlie'niediiiin i ofythe rack. In'this'manner inany given Figure 1 is a side elevation of af'wren'eh positionof the jaw-8; thepiec'e-17 will ba I'i. .80

25 made inaccordance with my invention. against the side 24 of the oning- 22 nd Figure 2 is' a fragmentarysectional"view 'preventm'ovementthereof 1 in one-direction, of the headortion of the wren chg a whilethepiece 16 with aflresilient "fOICB Figures 3 and 4t are side views of theworm oppose the movement otsaid'jawin are'v'ise i direction; Thus whilethe worm and rack present form is particularly adapted usually thefrictional engagement of the several comprises a stock 5 provided at oneend with parts will positively eliminate the undesiraa fixed jaw 6 and aguideway 7 in which a ble back-lash, and the accurate adjustment 7movable jaw 8 is slidaloly held. The latter and proper action of thewrenchwill be asa is generally provided with a toothed rack 9 sured.

engaged by a suitable'worm adapted for I claim: o o manual manipulationand usually mounted 1. Awrench comprising a stock having a for rotationon a screw-shaft 12 preferably fixed jaw, a movable jaw slidably mountedremovably held in the stock. on said stock and provided with a: toothedone piece, and in order to provide the necesstock having the threadsthereof arranged sary freedom in operation, a slight'clearto maintainthreaded engagement "with said ance between the worm and rack teeth hadteeth in said. rack and adapted for axialdis- I to be provided for. Suchclearance, however, placement relative toeach other. 45 produces aproportionate back-lash and" 2A wrench comprisinga stockhaving alooseness of the wrench parts during the opfixed jaw, a movable jawslidably mounted eration' thereof, and since the looseness beon saidstock and provided with a toothed comes enhanced with the continued useof rack, and a pair of rotatable worm-threaded the wrench, the accuracyof adjustment of members on said fixed jaw capableof axial T the lattersoon becomesconsiderably imbut not rotative' displacement relative to VV J o 7 each other and "adapted to 1 simultaneously 7 1 In accordance,however, with my invenmaintain threaded engagement with'the rack' tionthe worm is formed of two pieces '13 of said movable jaw. v I g and 14each of which is mounted for rota 3i Wrench comprisinga'stock having a 155 tion on 'said shaft 12, and adapted to in fixed-jaw, a movable. jawslidalolyhld jo n" dividtiall 'v ens" e 'the'teeth. of the rack. 9;stock aiidprovided; with again paired.

of axially aligned rotatable members mounted in said and ii maintainingthreaded engagement with said rack independently of each other, saidmembers being capable of v axial displacement with respect to eachother, and means for resiliently pressing one I of said members axiallyagainst said rack.

f 4. A wrench comprisingia stock haying fixed jaw, a movable jawslidably' held on se id stq kan tp ev de w h a t hed ac a jrotatableworm mounted in said stock adaptedto engage said rack to slide the jaw,

' andmeans,independent'of said worm operatifije againstia tooth of saidrack to res lientlypress saidrack longitudinally to ther teeth thereofagainst; said worm.

5 A {wrench ,comprisingva stock haying a a 'sli dable jaw mounted onsaid stock and proyided with a toothed rack, a

,oi rotatable axially. aligned worms 7 rfionnted said Istock andarranged to have s aid,rack.in all Igotative positions of the W9 rms, ,said flworms being held against relatigerotatiye inoyement but capableoft-rela tiye axialdisplacement while in engagement with sa d vrack,and; a spring pressing. one of axially againstfth'e said teeth.

. l sitoc eeaq 38 preyide iwi ha q d-rae means or sa fla te ia c mpr g aw pi egeworm member mounted for rotation in of said pieces havingthethrsadt e eof ar n t maintain a ihmfidfldngagement withthe teeth ofsaid capa l n a a ovement toward r threads-engage between the teeth of'iiriiiishfihle j w moun d i said stock 6 each other while so engaged,said pieces be ing held against relative rota-tiye movement,

and a spring interposed between one of said and provided with a toothedrack, a screwshaft in said stock, a two piece worm member held-togetheron said shaft for rotation as a whole, each of said pieces having .thethread thereof arranged to maintain a threaded engagement with the teethofsaid rack and capable of axial moyementtoward each other while soengaged, and a encircling said tween one of said pieces and adjacentportion of said stock arranged to press said piece axially against theteeth o fsaid rack,

whereby the latter may exert acorrespond:

ing pressurev against the other piece;

8. A wrench comprising a stock havingja fixed jaw, a-movable jawslidably-.mounted on saidstockand provided with a toothed raclgandrotatable wormsinisaid stock having the threa ds thereof; arranged forresilt eng m nt Wi t e tee h 1"; said rack the threads of onewormrengaging sideso f rack teeth oppositely related to thosefemgagedbythe other worm. r V

V In testi on y whereof, I.havelherenntoset,

my nd1. t Seattle, iWaShington, thisfifli day of June, 1925. r 7

p ng shaft and interposed be VQHAUNQEY' swarms;

